[PATCH v3] arm64: dts: ti: k3-j784s4-j742s2-evm: Add overlay to enable USB0 Type-A

[Siddharth Vadapalli <s-vadapalli@ti.com>]

The USB0 instance of the USB controller on both the J742S2 EVM and the
J784S4 EVM supports a single USB interface at a time among the following:
1. USB3.1 Gen1 Type C interface
2. Two USB2.0 Type A interfaces via an on-board USB Hub.

By default, the USB3.1 Gen1 Type C interface is supported on both of the
EVMs. Enable the USB2.0 Type A interface by configuring the USB2.0_MUX_SEL
mux. Additionally, set the Dual-Role Mode to Host since a Type-A interface
is only associated with the Host Mode of operation.

Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com>
---

Hello,

This patch is based on linux-next tagged next-20250409.

v2 of this patch is at:
https://lore.kernel.org/r/20250226124245.9856-4-s-vadapalli@ti.com/
Changes since v2:
- Rebased patch on next-20250409 and dropped other patches which were
  present in the v2 series.

Regards,
Siddharth.

 arch/arm64/boot/dts/ti/Makefile               |  7 +++++
 .../ti/k3-j784s4-j742s2-evm-usb0-type-a.dtso  | 29 +++++++++++++++++++
 2 files changed, 36 insertions(+)
 create mode 100644 arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-usb0-type-a.dtso

diff --git a/arch/arm64/boot/dts/ti/Makefile b/arch/arm64/boot/dts/ti/Makefile
index 03d4cecfc001..c7f23fbce660 100644
--- a/arch/arm64/boot/dts/ti/Makefile
+++ b/arch/arm64/boot/dts/ti/Makefile
@@ -128,6 +128,7 @@ dtb-$(CONFIG_ARCH_K3) += k3-j784s4-evm.dtb
 dtb-$(CONFIG_ARCH_K3) += k3-j784s4-evm-pcie0-pcie1-ep.dtbo
 dtb-$(CONFIG_ARCH_K3) += k3-j784s4-evm-quad-port-eth-exp1.dtbo
 dtb-$(CONFIG_ARCH_K3) += k3-j784s4-evm-usxgmii-exp1-exp2.dtbo
+dtb-$(CONFIG_ARCH_K3) += k3-j784s4-j742s2-evm-usb0-type-a.dtbo
 
 # Boards with J742S2 SoC
 dtb-$(CONFIG_ARCH_K3) += k3-j742s2-evm.dtb
@@ -212,10 +213,14 @@ k3-j721e-sk-csi2-dual-imx219-dtbs := k3-j721e-sk.dtb \
 	k3-j721e-sk-csi2-dual-imx219.dtbo
 k3-j721s2-evm-pcie1-ep-dtbs := k3-j721s2-common-proc-board.dtb \
 	k3-j721s2-evm-pcie1-ep.dtbo
+k3-j742s2-evm-usb0-type-a-dtbs := k3-j742s2-evm.dtb \
+	k3-j784s4-j742s2-evm-usb0-type-a.dtbo
 k3-j784s4-evm-pcie0-pcie1-ep-dtbs := k3-j784s4-evm.dtb \
 	k3-j784s4-evm-pcie0-pcie1-ep.dtbo
 k3-j784s4-evm-quad-port-eth-exp1-dtbs := k3-j784s4-evm.dtb \
 	k3-j784s4-evm-quad-port-eth-exp1.dtbo
+k3-j784s4-evm-usb0-type-a-dtbs := k3-j784s4-evm.dtb \
+	k3-j784s4-j742s2-evm-usb0-type-a.dtbo
 k3-j784s4-evm-usxgmii-exp1-exp2-dtbs := k3-j784s4-evm.dtb \
 	k3-j784s4-evm-usxgmii-exp1-exp2.dtbo
 dtb- += k3-am625-beagleplay-csi2-ov5640.dtb \
@@ -246,8 +251,10 @@ dtb- += k3-am625-beagleplay-csi2-ov5640.dtb \
 	k3-j721e-evm-pcie1-ep.dtb \
 	k3-j721e-sk-csi2-dual-imx219.dtb \
 	k3-j721s2-evm-pcie1-ep.dtb \
+	k3-j742s2-evm-usb0-type-a.dtb \
 	k3-j784s4-evm-pcie0-pcie1-ep.dtb \
 	k3-j784s4-evm-quad-port-eth-exp1.dtb \
+	k3-j784s4-evm-usb0-type-a.dtb \
 	k3-j784s4-evm-usxgmii-exp1-exp2.dtb
 
 # Enable support for device-tree overlays
diff --git a/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-usb0-type-a.dtso b/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-usb0-type-a.dtso
new file mode 100644
index 000000000000..ba15d72d86d6
--- /dev/null
+++ b/arch/arm64/boot/dts/ti/k3-j784s4-j742s2-evm-usb0-type-a.dtso
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/**
+ * DT Overlay for enabling USB0 instance of USB on J784S4 and J742S2 EVMs for
+ * Host Mode of operation with the Type-A Connector.
+ *
+ * J784S4 EVM Product Link: https://www.ti.com/tool/J784S4XEVM
+ * J742S2 EVM Product Link: https://www.ti.com/tool/J742S2XH01EVM
+ *
+ * Copyright (C) 2025 Texas Instruments Incorporated - https://www.ti.com/
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio.h>
+
+&exp2 {
+	p12-hog {
+		/* P12 - USB2.0_MUX_SEL */
+		gpio-hog;
+		gpios = <12 GPIO_ACTIVE_HIGH>;
+		output-high;
+		line-name = "USB2.0_MUX_SEL";
+	};
+};
+
+&usb0 {
+	dr_mode = "host";
+};
-- 
2.34.1